PSI - Issue 14

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XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Thermo-mechanical modeling of a high pressure turbine blade of an airplane gas turbine engine P. Brandão a , V. Infante b , A.M. Deus c * a Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal b IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal c CeFEMA, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal Abstract During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Identification of Dislocation Reactions and their Role in Uni-axial Deformation of Copper Single Crystals Ashish Mishra, Alankar Alankar* Department of Mechanical Engineering, Indian Institute of Technology, Bombay, Powai, Mumbai, 400076, India Abstract This work shows the analysis of dislocation dynamics analyses of copper single crystal. copper single crystal with uniaxial tensile loading axis along [1 1 1] crystallographic axis is considered. Each dislocation dynamics simulation cell is populated with Frank-Read sources randomly distributed on octahedral slip-systems. The strain-hardening behavior of a single crystal is controlled by interaction between dislocations which may result into formation of junctions. The interactions occurring between the dislocations, formation of junctions, occurrence of cross-slip and dislocation density evolution were analyzed. The contribution of individual reactions on the evolution of stress was then analyzed and strain-hardening coefficient representing each reaction was determined. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Keywords: Dislocation Dynamics; Hardening; Crystal Plasticity; Frank-Read sources, ICME 1. Introduction Plastic deformation in metals is caused by movement of dislocations. Dislocations account for work hardening by means of their multiplication and interaction with each other (Cottrell (1953)). For linking dislocation mechanisms to constitutive equations in crystal plasticity, a tool capable of tracking dislocation movement and interaction over time is required. Discrete dislocation dynamics is one such tool in which evolution of individual dislocation lines can 2nd International Conference on Structural Integrity and Exhibition 2018 Identification of Dislocation Reactions and their Role in Uni-axial Deformation of Copper Single Crystals Ashish Mishra, Alankar Alankar* Department of Mechanical Engineering, Indian Institute of Technology, Bombay, Powai, Mumbai, 400076, India Abstract Thi work shows the a alysis of dislocation dyn m cs analyses of copper single crystal. A opper single crystal with uniax al tensile lo ding axis along [1 1 1] crystallographic axis is considered. Each dislocation dynamics simulation cell is populated with Frank-Read sources ra domly distributed on octa edral slip-systems. The strain-hardening behavior f a single crystal is controlled by i teraction between dislocations which may result into formation f junctions. The interactions occurring between the dislocati ns, formation of junctions, occurre ce of cross-slip a d dislocation density evolution were analyz d. The contribution of in ividual reactions on the evolution of stress was then analyzed and strain-hardening coefficient representing each reaction was determined. © 2018 The Authors. Published by Elsevier B.V. This is a open access article under the CC BY-NC-ND lic nse (https://creativecommons.org/licenses/by- c-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Keywords: Dislocation Dynamics; Hardening; Crystal Plasticity; Frank-Read sources, ICME 1. Introduction Plastic deformation in metals is caus d by movem nt of dislocations. Dislocations account for work hardeni g by means of t ir m ltiplication and interaction with ea h oth r (Cottrell (1953)). F r linking dislocation mechanisms o constitutiv equations in cr stal plasticity, a to l capable f track ng dislocation movement and interaction over time is required. Discrete dislocation dynamics is one such tool in which evolution of individual dislocation lines can © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +91-22-2576-9356; fax: +91-22-2572-6875. E-mail address: alankar.alankar@iitb.ac.in * Correspon ing author. Te .: +91-22-2576-9356; fax: +91-22-2572-6875. E-mail address: alankar.alankar@iitb.ac.in

2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is a open access article und r the CC BY-NC-ND lic nse (https://creat vecommons.org/licenses/by- c-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers.

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 10.1016/j.prostr.2019.05.065